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RFD to USN: distance & flight time
Rockford (Chicago Rockford International Airport) → Ulsan (Ulsan Airport)
6,539 mi
10,523 km · 5,682 nm
13h 17m
estimated nonstop flight time
+14h
time difference · heading northwest
See live RFD→USN fares Phone-only fares on this route — call free
Flight time details
6,539 miles nonstop takes roughly 13h 17m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time gain when reading arrival times on your ticket.
The two airports
- RFD — Chicago Rockford International Airport · Rockford, United States
- USN — Ulsan Airport · Ulsan, South Korea
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near RFD
Near USN
- KPO · Pohang Airport (G-815/K-3)28 mi away
- PUS · Gimhae International Airport37 mi away
- TAE · Daegu Airport44 mi away
- CHF · Jinhae Airbase/Airport (G-813/K-10)48 mi away
Frequently asked questions
How far is RFD from USN?
The flight distance from Rockford (RFD) to Ulsan (USN) is 6,539 miles (10,523 km, 5,682 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from RFD to USN?
A nonstop flight takes about 13h 17m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Rockford and Ulsan?
Ulsan is 14 hours ahead of Rockford.
What is the cheapest way to fly from RFD to USN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on RFD–USN that never appear on search engines, with no booking fees.